Semi-Conductors

Question 1

What are the two types of Semi-Conductors?

Answer 1

Intrinsic & Extrinsic

Question 2

What are the properties an Intrinsic S.C?

Answer 2

Has no impurities & #electrons = #holes

Question 3

What are the properties an Extrinsic S.C?

Answer 3

Has impurities, & 2 types = N-type and P-type

Question 4

What is the net charge on an N-type S.C?

Answer 4

Negative (N for negative)

Question 5

What is the net charge on an P-type S.C?

Answer 5

Positive (P for positive)

Question 6

In an N-type S.C how many valence electrons does the Dopant need to bond? Are there less or more holes?

Answer 6

Dopant needs to have more than > 4 valence electrons in order to bond. This results in less holes

Question 7

In a P-type S.C how many valence electrons does the Dopant need to bond? Are there less or more holes?

Answer 7

Dopant needs to have less than < 4 valence electrons to bond. This results in more holes

Question 8

Where is the Fermi lvl located in a N-type S.C?

Answer 8

Just under/below the Conduction Band

Question 9

Where is the Fermi lvl located in a P-type S.C?

Answer 9

Just above the Valence Band

Question 10

What is the Band Gap in a Semi-Conductor? **

Answer 10

Band Gap in Less than or equal to <= 3 eV

Question 11

What happens at 0k in a Semi-Conductor?

Answer 11

Nothing works at 0k. At Temps > 0k, Conductivity = 0